可以使用循环将数组推入数组，如下所示。

$data = escape_array($data);

        $pms_data = [
            'unit_id'   => $data['unit_id'],
        ];

        if(isset($data['edit_pms_id'])) {
            $this->db->set($pms_data)->where('id', $data['edit_pms_id'])->update('pms_service_fee');
        } else {
            $this->db->insert('pms_service_fee', $pms_data);
        }

        $pms_id = $this->db->insert_id();

        $pms_service_fee_detail = [];

        / * Your Loop Here to Push the values to the array */
        foreach($yourArray as $key => $value) {

             $pms_service_fee_detail[] = [
               'pms_id'   => $pms_id,
               'pms_service_fee_id' => $yourArray[$key]['pms_service_fee_id'],
               'pms_service_fee_price' => $yourArray[$key]['pms_service_fee_price'],
             ];
        }

$this->db->insert_batch('pms_service_fee_detail', $pms_service_fee_detail);